Roch Castonguay is a Canadian film and television actor, who starred in the television shows Francoeur and sitcom Météo+.
Castonguay is from Prescott and Russell Counties, Ontario.
In 1979, he founded the Théâtre de la Vieille 17, with Jean Marc Dalpé, Robert Bellefeuille, and Lise L. Roy.
In 2005, he performed Une Saison en enfer. In 2007, he appeared in L'homme invisible.